YL Killer Sudoku

Ad-free, offline puzzles, group prompt

9x9/6x6 Killer Sudoku, ad - free! It supports group prompt, step - by - step hints, one - click marking of all candidate numbers, independent marking and drawing. There are multiple difficulty levels of questions built - in: Easy/Normal/Medium/Difficult/Expert/Extreme, with 1000 questions for each level. It can be played offline.

Killer Sudoku Rules: Numbers cannot be repeated in each row/column/box, each cage(dashed-line group) shows a sum for its digits, which must also be unique within the cage.